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Note 14 - Commitments and Contingencies (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended | 72 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2007 | Jun. 30, 2003 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016
Bonds and Letters of Credit Outstanding Amount |  |  | $ 1,514,000 |  |
Operating Leases, Rent Expense, Net |  |  | 1,027,000 | $ 976,000 |
Non-Cancelable Operating Leases [Member] |  |  |  |  |
Operating Leases, Rent Expense |  |  | 735,000 | 659,000 |
American International Group, Inc [Member] |  |  |  |  |
Period of Finite Risk Insurance Policy |  | 25 years |  |  |
Maximum Allowable Coverage of Insurance Policy |  |  | 39,000,000 |  | $ 39,000,000
Financial Assurance Coverage, Amount of Reduction During Period |  |  | 9,711,000 |  |
Financial Assurance Coverage Amount under Insurance Policy |  |  | 29,163,000 |  | 29,163,000
Sinking Fund Related to Insurance Policy |  |  | 15,546,000 | 15,460,000 | 15,546,000
Interest Earned on Sinking Fund |  |  | 1,075,000 | 989,000 | $ 1,075,000
Interest Income, Other |  |  | $ 86,000 | 31,000 |
Insurers Obligation to Entity on Termination of Contract |  |  | 100.00% |  | 100.00%
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] |  |  |  |  |
Financial Assurance Coverage Amount under Insurance Policy |  |  | $ 7,973,000 |  | $ 7,973,000
Interest Income, Other |  |  | 21,000 | 15,000 |
Financial Assurance Coverage Amount under Second Insurance Policy | $ 7,800,000 |  |  |  |
Annual Growth Rate of Financial Assurance Coverage Amount Under Second Insurance Policy | 1.50% |  |  |  |
Maximum Financial Assurance Coverage Amount Under Second Insurance Policy | $ 8,200,000 |  |  |  |
Sinking Fund Related to Second Insurance Policy |  |  | 5,941,000 | 5,920,000 | 5,941,000
Interest Earned on Sinking Fund under Second Insurance Policy |  |  | $ 241,000 | $ 220,000 | 241,000
Period of Finite Second Insurance Policy |  |  | 4 years |  |
Release of the Sinking Fund Related to Second the Insurance Policy |  |  | $ 5,941,000 |  |
Net Proceeds from the Release of the Sinking Fund Related to the Second Insurance Policy |  |  | 3,441,000 |  |
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Credit Facility Secured by a Bond [Member] |  |  |  |  |
Financial Assurance Coverage Amount Under a Bond |  |  | 7,000,000 |  | 7,000,000
Debt Instrument, Collateral Amount |  |  | $ 2,500,000 |  | 2,500,000
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Minimum [Member] |  |  |  |  |
Renewal Fee for Additional Year under Second Insurance Policy |  |  |  |  | 41,000
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Maximum [Member] |  |  |  |  |
Renewal Fee for Additional Year under Second Insurance Policy |  |  |  |  | $ 46,000

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